Śatapatha Brāhmaṇa ("of a hundred paths") 11.5.4.5

11.5.4.5

brahmacāryasītyāha brahmaṇa evainaṃ tatparidadātyapo'śā netyamṛtaṃ vā āpo'mṛtamaśānetyevainaṃ tadāha karma kurviti vīryaṃ vai karma vīryaṃ kurvityevainaṃ tadāha samidhamādhehīti samintsvātmānaṃ tejasā brahmavarcasenetyevainaṃ tadāha mā śuṣupthā iti mā mṛthā ityevainaṃ tadāhāpo'śānetyamṛtaṃ vā āpo'mṛtamaśānetyevainaṃ tadāha tadenamubhayato'mṛtena parigṛhṇāti tathā hāsya brahmacārī na kāṃ canārtimārcati na sa ya evaṃ veda

'Thou art a Brahmakârin,' he says, and thus commits him to the Brahman;--'sip water!'--water, doubtless, means ambrosia: 'sip ambrosia' is thus what he tells him;--'do thy work!'--work, doubtless, means vigour: 'exert vigour' is thus what he tells him;--'put on fuel!'--'enkindle thy mind with fire, with holy lustre!' is what he thereby tells him;--'do not sleep!'--'do not die' is what he thereby says to him;--'sip water!'--water means ambrosia: 'sip ambrosia' is what he thus tells him. He thus encloses him on both sides with ambrosia (the drink of immortality), and thus the Brahmakârin suffers no harm of any kind, nor does he who knows this.